RETURN VALUES

Upon successful completion, a value of 0 is returned. Otherwise, -1 is
returned and the global variable errno is set to indicate the error.

ERRORS

statfs() fails if one or more of the following are true:
[ENOTDIR] A component of the path prefix of path is not a directory.
[ENAMETOOLONG]
The length of a component of path exceeds {NAME_MAX} char-
acters, or the length of path exceeds {PATH_MAX} charac-
ters.
[ENOENT] The file referred to by path does not exist.
[EACCES] Search permission is denied for a component of the path
prefix of path.
[ELOOP] Too many symbolic links were encountered in translating
path.
[EFAULT] buf or path points to an invalid address.
[EIO] An I/O error occurred while reading from or writing to the
file system.
fstatfs() fails if one or more of the following are true:
[EBADF] fd is not a valid open file descriptor.
[EFAULT] buf points to an invalid address.
[EIO] An I/O error occurred while reading from or writing to the
file system.